Spring实战——Java配置管理

怼烎@ 2021-07-24 21:35 286阅读 0赞

**一 接口**

Axe

package org.crazyit.app.service;
    
    public interface Axe
    {
         // Axe接口里有个砍的方法
         public String chop();
    }

Person

package org.crazyit.service;
    
    public interface Person
    {
         public void test();
    }

**二 实现**

Chinese

package org.crazyit.app.service.impl;
    
    
    import org.crazyit.app.service.*;
    import org.crazyit.app.config.*;
    
    public class Chinese implements Person
    {
        private Axe axe;
        private String name;
        // axe的setter方法
        public void setAxe(Axe axe)
        {
            this.axe = axe;
        }
        // name的setter方法
        public void setName(String name)
        {
            this.name = name;
        }
        // 实现Person接口的useAxe()方法
        public void useAxe()
        {
            // 调用axe的chop()方法，表明Person对象依赖于axe对象
            System.out.println("我是："    + name
                + axe.chop());
        }
    }

StoneAxe

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class StoneAxe implements Axe
    {
         public String chop()
         {
               return "石斧砍柴好慢";
         }
    }

SteelAxe

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    
    public class SteelAxe implements Axe
    {
         public String chop()
         {
               return "钢斧砍柴真快";
         }
    }

**三 通过配置文件配置**

<?xml version="1.0" encoding="GBK"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.springframework.org/schema/beans"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
         
         <bean id="chinese"  class="org.crazyit.app.service.impl.Chinese">
               
               <property name="axe" ref="stoneAxe"/>
               
               <property name="name" value="孙悟空"/>
         </bean>
         
         <bean id="stoneAxe"  class="org.crazyit.app.service.impl.StoneAxe"/>
         
         <bean id="steelAxe"  class="org.crazyit.app.service.impl.SteelAxe"/>
    </beans>

**四 通过Java配置类配置**

package org.crazyit.app.config;
    
    
    import org.springframework.context.annotation.*;
    import org.springframework.beans.factory.annotation.*;
    
    
    import org.crazyit.app.service.*;
    import org.crazyit.app.service.impl.*;
    
    @Configuration
    public class AppConfig
    {
        // 相当于定义一个名为personName的变量，其值为"孙悟空"
        @Value("孙悟空") String personName;
        // 配置一个Bean：chinese
        @Bean(name="chinese")
        public Person person()
        {
            Chinese p = new Chinese();
            p.setAxe(stoneAxe());
            p.setName(personName);
            return p;
        }
        // 配置Bean：stoneAxe
        @Bean(name="stoneAxe")
        public Axe stoneAxe()
        {
            return new StoneAxe();
        }
        // 配置Bean：steelAxe
        @Bean(name="steelAxe")
        public Axe steelAxe()
        {
            return new SteelAxe();
        }
    }

**五 测试类**

package lee;
    
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    import org.springframework.context.annotation.*;
    
    
    import org.crazyit.app.service.*;
    import org.crazyit.app.config.*;
    
    public class BeanTest
    {
        public static void main(String[] args)throws Exception
        {
            // 创建Spring容器
            ApplicationContext ctx = new
                AnnotationConfigApplicationContext(AppConfig.class);
    //        ApplicationContext ctx = new
    //            ClassPathXmlApplicationContext("beans.xml");
            // 获取chinese 实例
            Person p = ctx.getBean("chinese" , Person.class);
            // 调用useAxe()方法
            p.useAxe();
        }
    }

**六 测试结果**

我是：孙悟空石斧砍柴好慢